Reducing the multiple access interference is a challenge to Multi-user CSS (Chirp Spread Spectrum) communication system. Based on binary chirp signals in multi-user system, a better method to reduce the multi-user interference and improve the system performance is proposed. Two principles of choosing the quasi-orthogonal chirp signals were deduced, (1)Time Bandwidth Product TmBw >=20, their cross-correlation is less than 0.2 and it is so little that the signals can be seen as quasi-orthogonal chirp signals (2) Cross-correlation ÃÂÿ<=0.4, the system Bit Error Rate changed a little. Through theory analysis and computer simulation, 4 slots multi-user chirp signals for WLAN communication systems were obtained, which have a good performance in reducing multiple access interference.
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机译：减少多址干扰是对多用户CSS（线性调频扩频）通信系统的挑战。基于多用户系统中的二进制线性调频信号，提出了一种减少多用户干扰并提高系统性能的更好的方法。推导了准正交线性调频信号的两个选择原则：（1）时间带宽乘积T m B w > = 20，互相关小于0.2，它是如此之小，以至于这些信号只能被视为准正交线性调频信号（2）互相关γ=≤0.4，系统的误码率发生了一些变化。通过理论分析和计算机仿真，获得了用于WLAN通信系统的4时隙多用户线性调频信号，具有良好的降低多址干扰的性能。
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